2. Clean the prepared mung beans, then put the mung beans in a container, add the water that has just passed the mung beans, put them in the freezer of the refrigerator, and take them out after freezing for 4 hours.

3. Put the frozen mung beans into the pot and add a proper amount of water. The best ratio of mung beans to water in mung bean soup is 1: 10. After the fire boils, turn to low heat and cook for about 10 minute. All mung beans have been boiled and blossomed. Turn off the fire and put it in a bowl. Add some sugar and mix well. Let it cool.